Scottish Water has said that the latest breakthrough by the tunnel boring machine (TBM) on Paisley’s interceptor sewer project marks a significant milestone on the £18M scheme.
“The breakthrough into shaft one on Rowan Street marks the 58% completion mark on the scheme and we’re delighted with this,” said Scottish Water project manager Brian Boland.
The Herrenknecht TBM – named Tunnelling Tanya – is being used by Amey and Donegan Civils to drive a 1.5km tunnel that will substantially reduce the frequency of spills from the sewer network into the Espedair Burn and White Cart Water in storm conditions.
Work on the overall scheme started two years ago but work on the tunnel drive started earlier this month. The breakthrough this week was on a 72m drive that was delivered in 10 days through soft ground but later drives will see the TBM bore through hard rock.